n. A soil consisting of a natural mixture of clay and sand, the latter being present in sufficient quantity to overcome the tendency of the clay to form a coherent mass.n. In founding, a mixture of sand, clay, sawdust, straw, etc., used in making the molds for castings. The compound must be plastic when wet, and hard, air-tight, and able to resist high temperatures when dry. Specifically called casting-loam.n. A vessel of clay; an earthen vessel.To cover or coat with loam; clay.